Nuclear Giant Resonance States and the Related Problems
Grant-in-Aid for Scientific Research (C)
|Allocation Type||Single-year Grants |
|Research Institution||The University of Fukui |
SUZUKI Toshio The University of Fukui, Faculty of Engineering, Professor, 工学部, 教授 (80115865)
|Project Period (FY)
2001 – 2004
Completed (Fiscal Year 2004)
|Budget Amount *help
¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 2004: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2003: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2002: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2001: ¥1,200,000 (Direct Cost: ¥1,200,000)
|Keywords||Gamow-Teller giant resonance / Double giant resonance / Sum rule / Nuclear relativistic model / Relativistic sum rule / 巨大共鳴状態 / ガモフ・テラー状態 / 相対論的乱雑位相近似 / 相対論的ガモフ・テラー和則 / 原子核の巨大共鳴 / ランダウ・ミグダルパラメータ / 多重巨大共鳴 / 原子核の相対論的模型 / 原子核の電子散乱|
The purposes of the project are
1.Determination of the value of Landau-Migdal parameter, which depends on the nuclear spin, from the giant Gamow-Teller resonance states,
2.Understanding of the double giant resonance states with model-independent sum rules, and
3.Investigation of the relationship between relativistic and non-relativistic nuclear models.
As to the purpose 1, we determined the value of the parameter from recent experiment, and have shown that the result is, in fact, related to the purpose 3.
As to the purpose 2, we have derived various model-independent sum rules not only for double giant resonance states which are recently observed experimentally, but also for triple giant resonance states. We have also derived model-independently some identities between their excitation energies and transition strengths.
As to the purpose 3, we have showed that the previous relativistic nuclear models have a serious problem. They explain phenomenologically well the structure of giant resonance states, but violate the sum rules. In order for the relativistic models to satisfy the sum rules, we need to renormalize the divergence of the nuclear response functions properly. We propose a method of proper renormalization by taking as an example the Gamow-Teller sum rule. We expect that the present result is a good starting point of the next project for the purpose 3.
Report (5 results)
Research Products (33 results)